etcd: Expand compat package tests. Define runtime dependencies. (#47689)

Adds test to validate the welcome message displayed upon invocation of
entrypoint script, is the Chainguard version. Follow-on from:
#47597.

Adds required runtime dependencies to -compat package, which where
previously defined as runtime dependencies at the image level. This
aligns with other similar packages.

---------

Signed-off-by: Mark McCormick <mark.mccormick@chainguard.dev>

Author: mamccorm

etcd-3.5.yaml

@@ -1,7 +1,7 @@
 package:
   name: etcd-3.5
   version: "3.5.20"
-  epoch: 0
+  epoch: 1
   description: A highly-available key value store for shared configuration and service discovery.
   copyright:
     - license: Apache-2.0
@@ -41,6 +41,14 @@ pipeline:
 subpackages:
   - name: etcd-3.5-bitnami-compat
     description: "compat package with bitnami/etcd image"
+    dependencies:
+      runtime:
+        - bash
+        - coreutils
+        - gawk
+        - grep
+        - posix-libc-utils
+        - procps
     pipeline:
       - uses: bitnami/compat
         with:
@@ -54,10 +62,17 @@ subpackages:
           ln -sf /usr/bin/etcdutl ${{targets.subpkgdir}}/opt/bitnami/etcd/bin/etcdutl
           cp LICENSE ${{targets.subpkgdir}}/opt/bitnami/licenses/LICENSE
     test:
+      environment:
+        contents:
+          packages:
+            - ${{package.name}}
       pipeline:
         - runs: |
             run-script --version
             run-script --help
+        - uses: bitnami/validate-welcome-message
+          with:
+            app-name: etcd
 
 update:
   enabled: true